ktvu's health and science editor john fowler has more. >> reporter: parents may think they are doing the right thing but doctors say the growing problems of diabetes may be caused by infant diets. >> reporter: he gets only breast milk. but a new study found 40% of babies under 40 months are getting solid food. >> mashing up fruit with rice cereal. >> sometimes you like them to have solid foods because they sleep better. [ laughter ] >> under 4 months we need to make it clear that has been shown to be related to higher risks of asthma. >> diabetes. each baby is unique but the ability to digest develops slowly. they recommend solid food only after six months. but 93% of babies by then are already eating solids, most with doctor approval. >> maybe give them cereal to start out with. >> reporter: he recommended daily cereal but the parents say they will wait. reporting live, health and science editor john fowler ktvu channel 2 news. >>> once it is authenticated a work out could be a new world record. [ music playing ] that is a lot of hula hoops. the listing is for the most students doin